Bakırköy is a neighbourhood, municipality and district on the European side of Istanbul, Turkey. The quarter is densely populated, has a residential character and is inhabited by an upper middle class population. The municipality of Bakırköy is much larger than the quarter and also includes several other neighbourhoods, such as Yeşilköy, Yeşilyurt, Ataköy. Bakırköy lies between the D.100 highway (locally known as E-5) and the coast of the Sea of Marmara. Bakırköy has a large psychiatric hospital called "Bakırköy Ruh ve Sinir Hastalıkları Hastanesi", and is an important shopping and commercial center.